Charak Samhita
तस्माच्छास्त्रेऽर्थविज्ञाने प्रवृत्तौ कर्मदर्शने। भिषक् चतुष्टये युक्तः प्राणाभिसर उच्यते ॥१८॥
॥ Qualities of pranabhisara (life saviour) physician॥ Hence, a physician possessing four qualities - indulgence in scientific knowledge, clear understanding, right application, and practical experience - is known as the one who promotes life i.e. pranabhisara.
english translation
tasmAcchAstre'rthavijJAne pravRttau karmadarzane। bhiSak catuSTaye yuktaH prANAbhisara ucyate ॥18॥
hk transliteration by Sanscript